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Device and method for extracting information from characteristic signals

a technology of characteristic signals and devices, applied in the field of devices and methods for extracting information from characteristic signals, can solve the problems that the position and orientation of signals in relation to the signal space cannot be accurately predicted in advance, and achieve the effect of higher accuracy

Active Publication Date: 2015-09-01
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to provide a system and method for extracting information from detected characteristic signals with higher accuracy. Additionally, it seeks to allow for effective extraction of desired signals even under poor ambient conditions, such as low signal-to-noise ratio, varying luminance conditions, and unsteady movements of the object being observed.

Problems solved by technology

As the disturbing signal component can be influenced by numerous disturbance sources, the position and orientation thereof with regard to the signal space cannot be accurately predicted in advance.

Method used

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  • Device and method for extracting information from characteristic signals
  • Device and method for extracting information from characteristic signals
  • Device and method for extracting information from characteristic signals

Examples

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Embodiment Construction

[0064]Recently, unobtrusive monitoring of vital signs, such as, by way of example, heartbeat, heart rate variability and respiratory rate, using a sensor, such as a camera, or remote photo-plethysmography devices, has been demonstrated. Basically, the underlying algorithms track an average signal emitted or reflected by a person or, in general, a living being, for instance, the color or tone of the skin of the observed object. The captured signal may vary over time with the blood volume and blood oxygenation. In general, however, this method is susceptible to motion of the object to be observed or to motion of the sensor with respect to the camera, further to local variations in the signal of interest, e.g. the skin tone, and illumination level changes and / or spectrum changes which are generally suspected of adversely affecting the monitoring result. In other words, the signal to be extracted is embedded in a captured signal having a poor, i.e. reasonably small, signal-to-noise rati...

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Abstract

The present invention relates to a device and a method for extracting information from detected characteristic signals. A data stream (76, 78, 80, 82) derivable from electromagnetic radiation (14) emitted or reflected by an object (11) is received and a plurality of characteristic index elements (50) varying over time can be extracted therefrom. The index elements (50) comprise physiological information (48) indicative of at least one at least partially periodic vital signal (12), and a disturbing signal component (58). For eliminating the disturbing signal component (58) to a great extent, the characteristic index elements (50) can be projected to a disturbance-reduced index element (64) having a distinct orientation in relation to a presumed orientation of the disturbing signal component (58). The disturbance-reduced index element (64) is chosen so as to reflect a dominant main orientation and length of the disturbing signal component (58) over time. Consequently, the mainly genuine physiological information (48) extracted from the data stream (76, 78, 80, 82) in this way can be utilized for determining the at least one at least partially periodic vital signal (12).

Description

FIELD OF THE INVENTION[0001]The present invention relates to a device and method for extracting information from characteristic signals, wherein the characteristic signals are embedded in a data stream derivable from electromagnetic radiation, in particular wherein the data stream comprises a continuous or discrete signal including physiological information indicative of at least one at least partially periodic vital sign.BACKGROUND OF THE INVENTION[0002]WO 2010 / 100594 A2 discloses a method and a system for processing images of living beings. The method comprises the steps of:[0003]obtaining a sequence of digital images taken at consecutive points in time;[0004]selecting at least one measurement zone comprising a plurality of image points, wherein[0005]the step of selecting at least one measurement zone includes analyzing information based on pixel data of a plurality of image parts in at least one of the images, each image part including at least one image point, and selecting each...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G06K9/00H04N7/18A61B5/00A61B5/024
CPCH04N7/18A61B5/0064A61B5/02438A61B5/7207
Inventor VAN LEEST, ADRIAAN JOHANDE HAAN, GERARDVERKRUIJSSE, WILLEM
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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